DB split up from SIL about a year ago, there was an OW who he now has a baby with. SIL stayed in the family home with DN aged 6 and DB moved 100 miles away to live with OW.
At the time I felt that this was pretty shit behaviour but stayed out of it as it's not my business really. Tried to be there for SIL and have helped her as much as possible with DN and so have my parents.
When I found out OW was pregnant I was not that surprised but said to my mum and dad that I thought OW was pretty stupid to have a baby with someone who has only just spilt with their wife. Both parents were very defensive and said that OW was really nice and nothing happened with her until DB had left SIL, which everyone else knows is not true, DB admitted as much to SIL plus she found messages.
My mum is still very much saying that DB has done wrong but everything is fine now. She also helps him a lot by taking DN to see him when he says it's too far (he chose to move there). He now only sees DN about once a month, less than before the baby was born. Mum defends this saying he is tired from having a newborn.
A few months ago he sent me a really nasty message saying that I had told everyone that OW was pregnant. I hadn't, what had actually happened was that as I found out when she was 7 months along I assumed I was the last to know and mentioned it to a couple of family members. DB was really angry and said that he never wants to speak to me again. I'm hurt by this but knowing him not that surprised as he has done this before and gone NC with parents and me before. He's been quite rude and hurtful to me off and on since we were adults (we are 37 and 39). DM in particular acts as though we are as bad as each other but I don't think we are. I did not respond to the message.
AIBU to feel that my parents should not be bending over backwards to go and visit DB and help him and see the baby when he is being so vile to me? I want them to say "look DB you need to stop being a twat to your sister and sort it out. It's no one's fault but yours that people think you treated SIL badly, or that you now live 100 miles away from your child and don't see her because the baby is keeping you awake. it's no reason to take it out on Avo". But they never will and say they will always support him because he is still their child.
I know DB suffers from depression but will not see a doctor about it. I also think he is treating DN really unfairly as she misses her dad. Again DM thinks that DN and DB have a great relationship and it doesn't matter. They may do now but it won't last if he doesn't see her very often.
I can't imagine letting my DS be horrible to my DD and not telling him he is out of order. AIBU?